/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineSessionInterface.h
Delegate fired when an unexpected error occurs that impacts session connectivity or use
typedef TMulticastDelegate_TwoParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, [ESessionFailure::Type](API\Plugins\OnlineSubsystem\Interfaces\ESessionFailure__Type) > FOnSessionFailure